Sasken Placement Paper

In the interview, they asked about Stacks, Queues, Linked lists, Binary Trees.
Few questions I remember are:
1) If u have a linked list library, how do u design stack and queue using it; write pseudocode.
2) What are static variables and functions?
3) Write code in C to count the number of 1s in a character (1byte).
4) What is pre-order, post-order, in-order; write code to print post-order.
5) Can u construct a binary tree given its inorder and postorder details. Is it neccessary or sufficient to construct tree. Asked an example to do in both ways.
6) If recursion is not used to print post order, what other data structure u use
(ans: Stack).
7)Can u use stack always in place of recursion?
(ans: Yes)
8) What are meta characters?
9) Write a piece of code to insert a node in a linked list.
10) About malloc.
11) About Operating System - Semaphores
12) About Computability (eg:- finding infinite loop), Complexity of algorithms
13) What does compiler and assembler do?
They asked grep command in Linux. How do u search '\n', using grep, in a file.
They may ask some other commands if u say u r familiar and recently been using linux.
About Networks? OSI reference model.
what does transport layer do?
TCP belongs to which layer?
IP belongs to which layer?
Where is error correction done?
What is a connection oriented/ connection less transmission?
What is meant by reliable transmission protocol? why is it called so?
What is flow control and where it is done?
About ur project?
Asked me expalin about the project in brief.
If u don't know anything, say it sincerely. U cannot bluff them. I too spoke to them sincerely.
They were cool. U need not get tensed. They won't attack you. Just they want to know ur hold about the subject.

They has conducted Two tests.One test is
C 10 Q for 10 Marks and Other one is in thier
corresponding B.Tech Subjects 15 Q for 15 Marks.For
CSE Students the subjects are Automata Theory Formal
Languages,Data stcures,Discrete Mathematics,Operating
System,Digital Logic Design,Computer Organisation,
Micro Processer and Computer Networks.

C Test------10 Q-10 M
Electives---15 Q-15 M
Duration of these two exams is 1Hr.
C Test
------
1.
What is the output of the Program?

In above declaration what type of variable is P?
Ans: P is array of pointers that each points to
a function that takes no arguments and returns
an int.
6.
What is the output of the Program?
struct emp
{
int a=25;
char b[20]="tgk";
};
main
{
emp e;
e.a=2;
strcpy(e.b,"tellapalli");
printf("%d %s",e.a,e.b);
}
Ans: Compile Error.
7.
What is the output of the Program?
main()
{
int a=5;
const int *p=&a;
*p=200;
printf("%d",*p);
}

CSEA01 Test
-----------
I haven't remembered the Qs.I has forgotten Qs.
They has given 5Q in OS,3Q in DM,2Q in ATFL,1Q in DLD,
1Q in CO,1Q in MP 1Q in DS,1Q in CN.

10 ques of C
10 ques of aptitude
10 ques of comp sc.

i m sendin the ques of comp sc whch might help u

COMP SC.

1. IN BINARY TREE IF PARENT HAS INDEX i then its left and right child
occurs at:
ans (a) 2i and 2i+1
2. 1 prog is given n scope is asked
ans (b) static scope (probably)

3. complete graph has
ans (b) n vertices and n(n-1)/2 edges

4. page fault is said 2 occur when:
4 choices r given probably (c)

5. probability that a frame is recieved with an error is P in a
system.
probability that the first frame to b recieved with an error is after
the first N frame is
(a) (1-P)*(p raised to power N)
(b) [(1-P) raised to power (N-1)]
(c) p raised to power N
(d) combination of N taken P at a time